Cardiff-by-the-Sea is located at latitude 33.022 and longitude -117.281. The elevation of Cardiff-by-the-Sea is 79 feet above mean sea level.

Since Cardiff-by-the-Sea is located within the City of Encinitas, all of the census and demographic data for residents of Cardiff-by-the-Sea are included as part of the information reported for City of Encinitas in the "Data" tab above.